German repeater with dead seconds and calendar Circa 1878

Important gold quarter repeating lever by A. Lange & Söhne
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An important German 18 carat gold hunting cased quarter repeating pocket watch with dead seconds, date and day, circa 1878. Extremely rare precision lever movement with dead seconds, calendar, quarter hour repeater in quality 1A, diamond endstone, screwed golden chatons, gold lever, gold escapement wheel. White enamel dial with Roman numerals, display for weekdays and date, blued steel hands. Plain à goutte Louis XV case. Dial signed, case numbered, movement signed and numbered. Comes with an extract of the archives.
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Diameter: 58
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Weight: 178 g
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Signed: A. Lange & Söhne Glashütte B/Dresden
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This piece is an absolute rarity. The company A. Lange & Söhne produced only 10 of these highly complex pocket watches, the number 11997 was the first. This watch is also the oldest known A. Lange & Söhne pocket watch with Louis XV case.